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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11bb9351e1ec7ca6a04f16e35eb742065d802f876452aec8d8e3af7c661bd77c' 
  AND token = 'yDYpaalrUHbUTyF6yiyrQnU0fdW3vmVfCVtxmIrfqvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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