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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e417735376f08cd30234005741771508139181192ffb8ef2b3727f5733d2f3ae' 
  AND token = 'VyeD3X7GZQPC662xm2UlHyFFhgvmlKIiXvmyO+1RU3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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