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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0df3dacd5d8b8be624b5b5f00584fc9ad690b0267517e2118d67e1fcdd5c752' 
  AND token = 'y+Je7HwEvBkqMIr122QsDN9Z1Ts51x/Fg7FjUfFDATg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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