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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dad8cd854ca82086342ee8d8279144f093ffd18e3225d3cca3091408dd28da8' 
  AND token = '2GoG1YqInsEBJRYs2ZX9R3hiEdUd5S056sIYMVH06/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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