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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '342f1f2c597af5af8f0c7228d6fb39a1f57270c6bbfe057a732da9c19ccde21c' 
  AND token = 'gTC1+WRX5+uD7IT6/bIMvxwhSIwrUU7KQWIDwPXbEAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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