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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c1dc87dedf6de91bd740e2b67b18aa1094171fb20c54685fc2ec67f9d272eb2' 
  AND token = '7thTJMGzbm0532kkWtlFdLYzQH4Zgtk3U+I0ANDsn4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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