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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2657374030785a77eafa13dc58e3b6a665f9241d55a579070914a300dd792cfa' 
  AND token = '1RXL4w0UodQuCVMVpR4z+uoWJ90mmAcy9fMtl49P7JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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