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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e2e9e97c7f9937b29128979da1e22b7c39f4adf8d125303ec495b5c9b28751e' 
  AND token = 'n04zcpFYnr7uRHa8SM8bVIfipamjmQVJL5x0AjjDmWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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