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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e4e2084b2ccb75d21a8da4d720140e326b037e2ffadc137cf4507ef5699351a' 
  AND token = 'FSeLqKk1md54c5yde/aL39kNbNjUr+0QhU1HyruXvkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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