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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e11475b5db01c4cf45e3536497a0d23838c2d075678e4e6ae9ae92bac84ee52a' 
  AND token = '2gXZEIcin+YnPb3q81j3tfvlwOfYQJJ02WPSIMvtpC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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