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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cffa21ef6c69e4183128f76dcb1042b7f17b52171fe8be4a406fe91813fb02d' 
  AND token = 'ME76tBW8zMOccn0oTRAdBhMUOOaN0OCLMEUDFAYujiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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