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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66aa7e319dab61a4511fc4142d34ecaa8115b9309e24c53422307026f37e057d' 
  AND token = 'hARHqnfyv1+6PHJOZIKlJy9eHiwuKlNkyRhSycPQWyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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