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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c92b090d2b2bf060f0bcfd106c654914f14491c39ba5fe99713e6f804593c4e' 
  AND token = 'Zrz2UCeh5Iuk1hcmUBUvIbruUDMDjTAxwsdFRAsKw88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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