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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '102735bd9298c081dbfc958d8acfe38e43215ef2ad87b7c287883bc7a2d6f57e' 
  AND token = 'kdCnFr8jOqTa3cRMRXgfEWstri/nJI/15Oto9HrrrJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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