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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec0a9f14eff1d046b3d255a9c4562168afc40506e0abe707fc0c2a4fc49334f2' 
  AND token = 'cx+/YK++p4icw0xX+SvN8afJrSu/7Xydng9fnAhdxVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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