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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '723abcf70610a96d1f3911588bcf172704a7e87a24842ccd201cb85fe4b49e70' 
  AND token = 'kGeuvfREZXm/k+w0waS4v/2k2hGYYeQtiZ72n8/EZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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