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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdf90aedbb81d6fc671d9131e4ee2bbcb8dcb545d5583c7f69c6cd37178e04f4' 
  AND token = 'by2faNWgC0BBfILoWqlJGol7vWNf2RuZFS9ZWvMJ41s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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