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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e170e306be900eceb1b052af7510a63d21dbefef7164babd27e0b0ec3b729d0' 
  AND token = 'puOvyiTxXPfTvGuR8UDfNU1t+hklWaczZo5gBnk2Cdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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