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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee04af2661527a3eb56329940e61ca77fe05964dd11f1add9e0955c859806a7c' 
  AND token = 'IFAuQ0Ca72+DXM0bqcAzfl1FprB4F8yuZcHtVIMP2Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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