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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6061719326f5ff40c77895cd4a02405630e7ff324b1949816fd674c419d5f1f4' 
  AND token = 'TMVNgkPp15Veq4AmRkG7lIaZZ0bLP8TfWNXvYGIaqUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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