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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70e8b385a0293d8fe5327ccae7aa90acd183a2ff28955527ead0f45b43adbe18' 
  AND token = '5OXXOlYpv0MqEDVoqGadmKGA9Pesh9Fl4pAx5o/ty0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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