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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6924d61e9628cb8834ce81dd5fd711897a4b2bd8a3888e76847b650dde4e84c6' 
  AND token = 'srbAcxzmGJWbF9QnXAk/n6HJqniQo7pHVmneoyZQiwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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