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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5deb84101516109d19d50f227811afad8a3af24b6e7d5322bc894845595d372d' 
  AND token = 'AwjThjGIV9nwJnsw8LINB1ow0f1ULmmD6S8dSxrwUVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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