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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e05c541dacc66eed8c0c32eb9d0cfbce02263beb3de5ec74f18c3e2f9b59e81f' 
  AND token = 'SfYVn2Uus1sPR+EtPjqQ6cx4ZTjpN+5pdUgFfk+VPkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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