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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '453d324e48b2c15bf010b465a475beeef16f3c3234078e08fea58c370ae72dbe' 
  AND token = 'SqA15FnDbZSM+gfL1rk+VNiyIdZwX7KR8dtuCG6puA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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