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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f762c9005060f75e863c9a082671c664fd317393cbb0d46516d5755095672bdb' 
  AND token = 'ZWF97Z2k+Z9xq5t4qx4ACAnnRkukXRgdDAbyJvblJNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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