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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8411531ab7ae484eb7da12cee015f2aa5b12abfa49c56d3530c71abeb4b6017e' 
  AND token = 'VnuB8FTBnvt4CJyAFvf9DrhNa6PvmtUYAzfIfwcIh7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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