SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09998c9786fc3f140b6608eb9d878948255fdfb99e58031504574a9475d5ee73' 
  AND token = 'sg05JKcVSYz26QK8Cq8m/VrlJL2hczvhsMDCiYLVFBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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