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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b40f9bd7d1d419ece27c0049aa132591c71989e2b5f7e2d5bfc19211a8c0033' 
  AND token = 'fa3GtbZ1+UoTRIqu9a8SVOGdsNW3z/8+FhGQOUvhPJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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