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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb8e378bbab6debb6ecd288d83fcb9138d554974777823b1d7289171deb93078' 
  AND token = '804LFq44oWxkjXjZUh2Uc1XvCAvA0JJqDhEp73+5M7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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