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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6372c0382849e2e7259f5944bc2d15e2491a4e30e55151cc730ed430fc3ce5fd' 
  AND token = 'J/vFPrleQrX5UxyHvt8Vbfo7NX3ggTQwnv8qwl922w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}