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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a5e31d4e97e65ed26e87f7ea12247e5d5761f1bbd3174a19c99ab0935d7fc7b' 
  AND token = 'zKoo4kLIOCi28efp7AiGNc/ztYcrgFdCAqPxQMY9TUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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