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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3b31e0bfdb31f98ae6028ec9de40324be3e60061266f9a0634a3c888b325d8b' 
  AND token = '5p7PA+OvVDbDI/4y+XOoA4deOmU9aHj4XygJJWhtwNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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