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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6175e007c1d0ba56aca2ba3fb7b975d7caab9322c4a63345870b368fe595df4d' 
  AND token = 'EKFuG/67u08s8P3yRlHN9dzWNAQXd3zFxuQwHYIecx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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