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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08d67bb290bedc2e1e8451e675918ec7f5d2a6944dc4d164ec6f9a8e47091c89' 
  AND token = 'iT9yBeyNU2/g03qRpjZ+8cw+gEyqZy5I5YL6a4DM9Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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