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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40a3f1f10cc407f40cef09e01750942a58f08a570714cfbbbf229fe0ecd27c1a' 
  AND token = 'bu0AK0NAfDiNtHdm1ybA2gn2lVcSL/L3IrEv9Ztykl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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