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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c61509955ce2c762c34f014f2ac8a381cb661e5b7b493e45b48b72db501193e0' 
  AND token = 'g12h/vnsuxhSMPSLLmC2EEczPwduPwa2/4MlEJRReag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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