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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a8e07f09a7fe805f31f73dec7a5423d59ae5ecd576c0a804ba429d6ee5f5d2f' 
  AND token = '2fukXKn3p2mToyMoPICwn1Lxw8JXofHit9rniy8bexA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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