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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03092e70681ca5573bdbb6da310c90e4c22185a9d92caa794a00176e4c75a928' 
  AND token = 'C66+Aj0LVeb3jXgrkrpc0bl/uBXuaGgZn+M2gmwtcFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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