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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19fa46e3ea7c11912cd3f92a627ae99dff61d3795eb265ca3c793b6385073651' 
  AND token = 'OI5G3irLn/7DVeN0V3UZ54kYtOqo2ooDij4WUDVzZMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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