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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6388dbdcb43b5c2fe635e30e81147f0d6bd758a44a54a133d272cb7e3973b224' 
  AND token = 'ZSitDHLlJZE3gLrNXbobE9V3qymtulWa9Fg4E0jS4bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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