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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '479d882ee85f925ef55d717c25be85558eef13aa3e33fb5408ef1d2c7745bf7d' 
  AND token = '36qhYPoCHc1EghSdK2sEkCmrk6FCVx5bPrXwwJ7BIs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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