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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ed6c43187c3325fbf4de55389fc4784d3529a46eba3c45a76ee95f1edcb7124' 
  AND token = 'k25MjP++kvURol7H1+2/KwImD3IfOikyBLt3NyyNHHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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