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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a5715bc1aefe60a517f46d57e1326b83cdc123f7c7fee90fc05850d5b9c37ac' 
  AND token = '2yQQQWP5zmtyVv7rIk6wzQpOCnKfzA4Uwvniv6gP9hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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