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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4f357b883c670589350402e3e1541160d8ee5200f124f6aac92d5d2129ac075' 
  AND token = '/faoVdJ9wJT3FnWIdH45G0qd6Ozr4MSCSBd1WIjsIOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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