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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67a92e3f303ab06a0f5d60555e565cb5489d1eec5fee8e05a1fe01a13886d8f2' 
  AND token = 'aaHeHbePa3G0HKwMZ9cBvfpo+lxfsFiljQqGMMh+Skk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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