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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15cb95bd135d0ac430b304ad750e1349caef96e7af20271f75a4682ff4cec515' 
  AND token = 'zG9o94rvljgaNmG62E1rJUmylQkX4hHzoafaNt0GBTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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