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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f2e1ed1a281fd904e0c1164450d2b850d54000c1309399b6e47e7c2c85bbefd' 
  AND token = 'L8c1AMoTeidl9cC8isO2e2bMN+Zrl3Y2Prs8oP0aDgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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