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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfad1cefbf313ef2a9792db7d0c537a5cbc4fc5755b0ba761f678036dead924d' 
  AND token = '9Ob+6bBM2bs+mVTKNcopPQvkjDM0of3cZadHDs4dyTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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