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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed52b4eeca88a71917ca4944de3ef527309e885755d6bc4e18790856d4b86ba4' 
  AND token = 'kmUY920lYDta7X8BWy5F8xnrskgyIC7lYaPlZUCmNE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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