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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41dcb06629904d5a6524a8a34b00f03b1f84478b80a4f2985593fc1d121a75d0' 
  AND token = '3rOd4O3XpKCb10Z4X/cxajbH03kdEWgLERGVMYhlxkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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