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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dcfefb60a8bbdbff62c4bec89a3ed735e825037b6d44d77566b41ab8a62c7ce' 
  AND token = '6ff1RmAvroxcy+vTMtyZCp2JMcnZ4E4YDGhqvQcXNQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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