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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddc0311722acddd9560b5058389478d93106a12eed311415c4b17ba797d47551' 
  AND token = '8jJaLKSuuWqeSNItD6mWkvPW9ZybbW64NZ8mq8/sDQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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