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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '367a250fb2392df68cbb0afb2e9b53395a016ba1f9cfe4b2d3d656321e066052' 
  AND token = 'MUCcMTfSvxIc0eR6nnvYJ5O+//QW6xabmeqQ7FmLaMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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