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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb2d511a0ac8cc617fcf6b0ad153fb88ceb8c5879beca84376d48a2f3522f179' 
  AND token = 'bQ2DGHItIPrwmsetfz8eRfZOCPkMCzUSeAtbsEB3aas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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