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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7716278939064e555a1363970352e404c7f24fb1a26ea7692fb19797850aa2d' 
  AND token = '2zThvUvl5ANrYKkL79KAeXD6pYsWBngFzi0NVrlimRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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