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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd07d2daac35205626dc3abe102026865bbf94cde15cbcc17454551efacacbadf' 
  AND token = '8CNsJj58rAtuB0ZCkL098zw9rkPXHaSb8FLvt9TUwRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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