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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd19c103a0ad61360525814c3cec4756ba289a6182ed7cc7735f97ef23a694c71' 
  AND token = 'aiGipssf2Dq77TC7yI4qk9cI5i3ZZNcas0v87v5c56M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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