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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae09e5acd66fac90da2da2988b48f2373ae078d85f8eecd311208fa0fea7934b' 
  AND token = 'reEZnjJMyjYqmPos+C7eNuXpp3ZBEUGN4EaDDgoOB5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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