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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1412ee5b76ca3ebc125fbd36c2461234b04a708672787be656f4d36a14ba0e3d' 
  AND token = 'FmqNYOq3WvTVNZ3n5ATeo5uB32yUEyF/YWbGmkwa4Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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